Submitted 3 months ago by SnokenKeekaGuard@lemmy.dbzer0.com to [deleted]
https://lemmy.dbzer0.com/pictrs/image/3c37e13b-e32f-436f-9399-c30798fefc63.webp
This is actually pretty important to being able to solve engineering problems in the real world. Invariably, every little sub industry has its own cursed unit system. And dimensional analysis is great for solving real problems on its own.
And if you get to a high enough physics level, they start setting hbar = c = 1 or G = c = 1, and you never have to worry about it again.
I’m the mean time, it’s worthwhile to learn the trick to do this stuff fast-ish.
I would like to introduce everyone to this video about cursed unit (youtube link warning)
kWh has an intuitive reason. Watts are so small that you’d always calculate consumption in MJ and whatnot, and seconds are so short that you’d always be expressing time in ks. Using kWh will reduce the numbers to useful ranges and makes cancelling M and k unnecessary.
Just divide by 3.6
Example:
10 km /h * 1000 m / km = 10,000 m /h
10,000 m/h * 1h/3600s = 10,000/ 3,6000 m/s = 10/3.6 m/s
Shit like this is why we need metric time.
don’t speak like the french
Shit like this is why metric needs to be replaced with a base12 system. Base10 is for children who still count on their fingers.
I’ll be pissed if the comments are about metric units
That’s interesting. Obviously, you’d put a center dot to disambiguate millihertz from meter-hertz, but I can’t recall ever having learned a rule about that. So some combinations of units are inherently ambiguous?
Thanks, I hate it
Saw a video using mHz recently and it took way too long to realise the readout was correct and nort a misspelling of MHz …
Wait what, jow many kilominutes per hour is one mile per stone?
African or European swallow?
Unladen or not?
Just multiply by (1000m/1km)(1h/60s) and cancel out the units, kids
Same order of magnitude, don’t bother with the trivial details.
Is it really tho? log(3.6) ≈ 0.55 so 1 km/h is really closer to 10m/s than 1m/s
It isn’t even that much of a time waste you just multiply 1000/3600
But it would take me a couple of hours to figure that out.
Have you tried converting those hours to seconds?
Don’t ky/s over unit conversions OP. It’s not that hard.
The true evil are the fuckers who post recipes in grams instead of cups and ml.
I don’t have time to get out a million little differently sized utensils because I need 2 cups of this, ¼ cup of that, ½ a teaspoon of the third thing etc. when I can put the bowl on a kitchen scale and use the tare function.
But I love that 😫
TheIvoryTower@lemmy.world 3 months ago
In a parallel universe, someone is memeing about how teachers waste our time on useless stuff and never taught us to convert between units.